Montana Sapphires - Available for Custom Engagement Rings

Gemstone specifications: 

• 0.49ct Trilliant Cut Montana Sapphire (5.00x5.00x3.06mm)
• 0.52ct Hexagon Cut Montana Sapphire (5.48x4.75x2.51mm)
• 0.52ct Kite Cut Montana Sapphire (6.98x4.91x3.01mm)
• 0.52ct Trilliant Cut Montana Sapphire (5.10x5.10x3.20mm)
• 0.53ct Trilliant Cut Montana Sapphire (5.02x5.02x3.22mm)
• 0.55ct Kite Cut Montana Sapphire (7.11x5.03x2.85mm)
• 0.71ct Hexagon Cut Montana Sapphire (5.60x4.80x3.31mm)
• 0.90ct Round Brilliant Cut Montana Sapphire (5.75x3.75mm)

Gemstone available for Custom or Bespoke pieces - get in touch with our expert design team to learn more about creating your own unique engagement ring.

If you're looking for a gemstone with particular specifications, contact our team to discuss sourcing your perfect gemstone from our international network of suppliers.

Jessica Flinn makes rings in UK sizes from E to Z+6. Please refer to the size choices above to see what sizes this product is available in.

If you know your ring size, but not your UK size, you can use our converter here.

Ready-to-Ship rings can be resized approximately 3 sizes larger or 3 sizes smaller, please allow 10-14 working days.

If you require a different size these can be made through our bespoke service please use the Contact form below.

One complementary resize is applicable to all Ready-to-Wear, Made-to-Order, Custom and Bespoke engagement and wedding rings, when redeemed within 3 months of delivery of your item. All re-sizes thereafter, or those outside of the 3 month time frame, will be chargeable.

*Please note - if you select "Send me a ring sizer" and your shipping address is outside of the UK, your ring sizer will be subject to standard shipping charges. We will get in touch with you to arrange payment for the shipping of your ring sizer.

*Some ring sizes require additional metal and/or diamonds to create, and therefore may be subject to an extra charge. In this circumstance, we will get in touch with you.

All Made-to-Order, Bespoke, and Custom Rings are available in:

• UK Sizes E-Z+3
• Recycled 9ct, 14ct or 18ct Gold, or Recycled Platinum

Please see the Shipping and Returns Policy tab below for more information on lead times.

Please note, any render images found on our product listings will vary slightly to the final product.

For all Made-to-Order engagement rings, a centre stone will be selected by our team to fit the parameters specified on the listing. Colours/shade will be matched as closely as possible to the image supplied on the listing, however final colour and shades may vary. If you would like to hand select a gemstone, we recommend opting for our Custom or Bespoke Design Services.

Our standard delivery aims

• Ready-to-Wear: 2-3 working days
• Ready-to-Wear with resize: 7-10 working days
• Made-to-Order Wedding Rings: Approximately 4-6 weeks
• Shaped-to-Fit or Bespoke Wedding Rings: Up to 10 weeks
• Custom, Bespoke or Made-to-Order Engagement Rings: Approximately 6-8 weeks
• Fine Jewellery - Please allow 7-10 working days

If you require an item to be delivered by a particular date please email us on ruby@jessicaflinn.co.uk before ordering.

Read our full shipping policy here.

Returns Policy

You can return Ready to Wear items to us within 14 days of receipt of order and we will be happy to offer you either an exchange or full refund minus any postage costs, providing the goods are returned in perfect condition with the original packaging. If you cannot return your items within 14 days of receipt of order, please contact us within this time frame. Items can only be returned outside of 14 days of receipt if approved in writing by ourselves.

Goods that are personalised, bespoke, resized, engraved or made-to-order to your specific requirements are custom orders, and therefore cannot be exchanged or returned under any circumstances.

The only exception to this would be if upon receiving the item a fault is present please contact us within a 14 day period. Read our full Returns Policy here.

We love to share images of the beautiful designs our customers create on both our website and our social media channels. We may share images of your ring on these channels, and as a courtesy we will wait a reasonable period of time from dispatch before posting the images we take.

We also love to share your stunning wedding and proposal pictures, and thank you so much to all our customers that allow us to enjoy their special moment with them. If you send proposal or wedding pictures and videos to our inbox, we will take this as consent to share your images on our website and social media channels.

It is the responsibility of the customer to make us aware if you would not like us to share any content before a certain date, and if we do not hear from you regarding this we may share images of your design and/or wedding and proposal images on our website or social media channels at any time.

We, as the creators of the item(s), control intellectual property rights over the piece and can share photos and videos at our discretion.

We've partnered with both Klarna and PayPal Credit to help you spread the cost of your purchase. 

For more information on our payment options, click here.

Accent diamonds

The majority of our accent diamonds are in the D-G colour range, and VS clarity range.

All accent diamonds will be a minimum of a H colour and Si1 clarity.

We predominantly use lab grown diamond accent stones, however we can supply earth grown diamonds or lab grown diamonds of a specific colour and clarity by request.

Hallmarks & Logo

Inside each of our rings, you will find a laser hallmark and our own logo mark. You can also choose to add personalised engraving.

Your ring will be laser marked with our full or half logo as standard. If you do not want your made-to-order, custom or bespoke ring to include this mark, please let us know when you place your order. Ready-to-Wear rings include this mark before purchase.

Your ring will contain a laser hallmark from one of the UK assay offices. If you would like any special or commemorative marks added to your hallmark please get in touch within 24 hours of placing your order. Laser hallmarks can wear away over time and during the polishing or resizing process, however it can be re-applied at any time.